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has a peculiar I2C Port ... We need to send the I2C Sub Address (Register ID) separately from the I2C Data ... This might cause the BMP280 Driver to fail

github.com/lupyuen/bme280-nutt

I2C Driver expects us to provide the I2C Sub Address ... Let's patch the BMP280 Driver to pass the Register ID as I2C Sub Address

github.com/lupyuen/bme280-nutt

Here's how we patch the BMP280 Driver to send the Register ID as I2C Sub Address (instead of I2C Data)

github.com/lupyuen/bme280-nutt

BMP280 Driver says it's 29 °C with air pressure 1,006 millibars ... Yep looks right for Sunny Singapore by the Seaside 👍

github.com/lupyuen/bme280-nutt

BMP280 Driver works OK with our BME280 Sensor ... But we're missing one thing: Humidity ... Can we port the BME280 Driver from Zephyr OS? 🤔

github.com/lupyuen/bme280-nutt

Zephyr BME280 Driver looks similar to BMP280 Driver ... So porting Zephyr BME280 Driver to NuttX might not be so hard 🤔

github.com/lupyuen/bme280-nutt

Our BME280 Driver reads the Sensor Data from Zephyr Driver in two steps: 1️⃣ Fetch the sensor sample 2️⃣ Get the channel data

github.com/lupyuen/bme280-nutt

Power Management works a little differently in vs Zephyr ... Here's how our NuttX BME280 Driver calls the Zephyr Driver to do Power Management

github.com/lupyuen/bme280-nutt

BME280 Standby Duration is static in Zephyr but configured at runtime in ... So we set it in our NuttX BME280 Driver

github.com/lupyuen/bme280-nutt

doesn't have a Sensor Type that supports BME280 Temperature + Humidity + Pressure ... So our NuttX BME280 Driver combines 2 Sensor Types: 1️⃣ Barometer Sensor (Pressure + Temperature) 2️⃣ Humidity Sensor

github.com/lupyuen/bme280-nutt

Each Sensor defines its operations for 1️⃣ Activating the sensor 2️⃣ Fetching sensor data 3️⃣ Setting the standby interval

github.com/lupyuen/bme280-nutt

Our BME280 Driver appears as 2 sensors: 1️⃣ "/dev/sensor/baro0" (Barometer Sensor) 2️⃣ "/dev/sensor/humi0" (Humidity Sensor) ... Here's how we read the Air Pressure, Temperature and Humidity

github.com/lupyuen/bme280-nutt

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Here's how we ported the I2C Driver (Temperature / Humidity / Pressure) from Zephyr to Apache OS ... Tested on

lupyuen.github.io/articles/bme

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